{"id":96,"date":"2009-09-29T12:03:36","date_gmt":"2009-09-29T12:03:36","guid":{"rendered":"http:\/\/beta.robertprice.co.uk\/robblog\/2009\/09\/setting_an_auto_increment_seed_in_mysql-shtml\/"},"modified":"2009-09-29T12:03:36","modified_gmt":"2009-09-29T12:03:36","slug":"setting_an_auto_increment_seed_in_mysql-shtml","status":"publish","type":"post","link":"https:\/\/www.robertprice.co.uk\/robblog\/setting_an_auto_increment_seed_in_mysql-shtml\/","title":{"rendered":"Setting An AUTO_INCREMENT Seed In MySQL"},"content":{"rendered":"

\nI’ve used MySQL<\/a> for many years and I’ve (nearly) always used AUTO_INCREMENT<\/code><\/a> to get unique primary keys for my tables.\n<\/p>\n

\nI came across a requirement earlier today that meant that I needed an id<\/var> to start from 100000, instead of the the usual 1.\n<\/p>\n

\nNormally I’d have just created a dummy record with an id<\/var> of 100000 so the next insert would occur at 100001. This works as AUTO_INCREMENT<\/code> automatically inserts the current highest value plus 1 for a column when you insert a row with NULL<\/var> or 0<\/var> for the row’s value. This isn’t very elegant so I spent a few minutes with the MySQL manual and found that it is possible to seed the AUTO_INCREMENT<\/code> to start at a specific value without having to use a dummy insert.\n<\/p>\n

\nWhen creating a table you add a seed value at the end of the create statement something like this…\n<\/p>\n

CREATE TABLE test(
\nid INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
\nname VARCHAR(50)
\n) AUTO_INCREMENT = 100000;
\n<\/code><\/div>\n

\nThis means the first insert will have an id<\/var> value of 100001 (the highest current value plus 1).\n<\/p>\n

\nYou can also alter an existing table to set the AUTO_INCREMENT<\/code> seed…\n<\/p>\n

ALTER TABLE test AUTO_INCREMENT=200000;
\n<\/code><\/div>\n

\nThe next insert will have an id<\/var> of 200001 now.<\/p>\n","protected":false},"excerpt":{"rendered":"

I’ve used MySQL for many years and I’ve (nearly) always used AUTO_INCREMENT to get unique primary keys for my tables. I came across a requirement earlier today that meant that I needed an id to start from 100000, instead of the the usual 1. Normally I’d have just created a dummy record with an id … Continue reading “Setting An AUTO_INCREMENT Seed In MySQL”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[2],"tags":[42],"class_list":["post-96","post","type-post","status-publish","format-standard","hentry","category-dev","tag-mysql"],"yoast_head":"\nSetting An AUTO_INCREMENT Seed In MySQL - Robert Price<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.robertprice.co.uk\/robblog\/setting_an_auto_increment_seed_in_mysql-shtml\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Setting An AUTO_INCREMENT Seed In MySQL - Robert Price\" \/>\n<meta property=\"og:description\" content=\"I’ve used MySQL for many years and I’ve (nearly) always used AUTO_INCREMENT to get unique primary keys for my tables. 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